Fix compilation against kernels < 5.4.110

The fix to handle the backport of 4e096a18 to linux-5.4.y is a bit
too broad, as it breaks building against kernels older than 5.4.110,
add a version check to fix.

Upstream-Status: pending
Signed-off-by: Scott Murray <scott.murray@konsulko.com>

diff --git a/sllin/sllin.c b/sllin/sllin.c
index b3f2636..a6fb120 100644
--- a/sllin/sllin.c
+++ b/sllin/sllin.c
@@ -1604,7 +1604,11 @@ static struct sllin *sll_alloc(dev_t line)
 	sl = netdev_priv(dev);
 	#if LINUX_VERSION_CODE >= KERNEL_VERSION(5, 4, 0)
 		can_ml = (void *)sl + ALIGN(sizeof(*sl), NETDEV_ALIGN);
+	#if LINUX_VERSION_CODE >= KERNEL_VERSION(5, 4, 110)
 		can_set_ml_priv(dev, can_ml);
+	#else
+		dev->ml_priv = can_ml;
+	#endif
 	#endif
 	/* Initialize channel control data */
 	sl->magic = SLLIN_MAGIC;